None.
The present invention pertains to toilet flushing systems and methods, and more particularly to a system and method that allows the user to select the quantity of water used for flushing the toilet.
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It is a well known fact that the largest use of water in most households and in many office buildings is for flushing toilets. Because flushing is carried out with the full capacity of the water in the water tank, the water usage is wasteful and is not required. In particular, conventional toilet tanks are designed to hold from three to eight gallons of water. In a family of four, it has been estimated that 20,000 gallons of fresh water could be saved yearly if the average flush were limited to between 2 and 2.5 gallons per flush.
A system and method is provided for flushing a toilet wherein the duration of the flush, and thus the amount of water used, is selectable by a user. Desirably, but not necessarily, the system and method is easy to install, universally adaptable to preexisting toilets, and uses a dial to allow a user to select the duration and thus the amount of water used in flushing a toliet.
In an embodiment, the system includes a controller and a non-buoyant flush valve that are coupled together via a linkage. The controller opens the flush valve for a time period set by a user wherein, once the time period has lapsed, the flush valve is automatically closed.
In yet another embodiment, a system is provided comprising a toilet bowl and a toilet tank attached to the toilet bowl so that when a toilet flush occurs, water from the tank drains into the toilet bowel. The tank includes a bottom surface having a tank drain comprising a valve seat and a flush valve removably mounted on the valve seat. The flush valve is made of a resilient material and has a hollow interior with an opening therethrough and an attachment point on its upper end. Loosely inserted into the interior of the flush valve is a weight that modifies the flush valve so its combined weight exceeds the specific gravity of water to make the valve non-buoyant. The weight is sized to allow a clearance between the circumferential perimeter of the weight and the inner surface of the flush valve so that the flush valve remains resilient near its lower perimeter to allow the valve to conform to and seal against the contour of the valve seat when the valve is in its seated or closed position. Also attached to the toilet tank is a controller for selecting a period of time to open the flush valve. Coupled to the controller and the flush valve is a linkage that is automatically released by the controller to close the flush valve once the period of time has lapsed.
In a further embodiment a system is provided comprising a toilet water tank attached to a toilet bowl so that when a toilet flush occurs, the water from the tank drains into the toilet bowl. The tank includes a bottom surface having a tank drain that includes a valve seat and a modified flush valve removably mounted on the valve seat. The flush valve is made of a resilient material and has a hollow interior with an opening therethrough and an attachment point on its upper end. Loosely inserted into the interior of the flush valve is a weight to modify the flush valve so the combined weight exceeds the specific gravity of water to make the valve non-buoyant. Also attached to the toilet tank is a controller for selecting a period of time to open the flush valve. Coupled to the controller and the flush valve is a linkage that is automatically released to close the flush valve once the period of time has lapsed.
In another embodiment, a method is provided for modifying a toilet flushing system to allow the quantity of water available in a toilet water tank for flushing a toilet to be selected by a user. The method includes removing the preexisting flush valve from the toilet water tank and obtaining a weight sized to loosely fit inside the flush valve. The weight is inserted through the opening in the flush valve and the flush valve is reinstalled in the toilet tank. Further, a controller is attached the toilet tank and coupled, via a linkage to the flush valve. Whereupon a period of time to open the flush valve can be selected and the linkage is automatically released by the controller to close the flush valve once the period of time has lapsed.
Other embodiments, systems, methods, features, and advantages of the present invention will be, or will become, apparent to one having ordinary skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be within the scope of the present invention, and can be protected by the accompanying claims.
The invention may be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. In the drawings, like reference numbers designate corresponding parts throughout.
The following descriptions of detailed embodiments are for exemplifying the principles and advantages of the inventions claimed herein. They are not to be taken in any way as limitations on the scope of the inventions.
In an embodiment in accordance with the present invention, a selectable toilet water level flushing system is provided to allow a toilet user to select the quantity of water used for a toilet flush. The selected quantity of water is dependent upon the type of waste to be disposed; for liquid waste, a partial flush is recommended while for solid waste, a full flush would be used. The quantity of water available for the toilet flush is controlled by the user selecting a time duration for a toilet flush.
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An aspect of the invention is the replacement of a normally buoyant flush valve 116 with a flush valve 216 that is not buoyant. In an embodiment, the nonbuoyant flush valve can be manufactured with a preinstalled weight contained or enclosed within the rubber or compliant flush valve. Alternatively, in another embodiment, the system 210 operates with the modified flapper valve 118 as shown in
The modified flush valve 216 is made of a resilient material, such as rubber and has a hollow interior 134. On the upper surface of the valve is located an attachment point 132 that attaches to the flush controller 228 via the mechanical linkage 230 and on its bottom surface as shown in
The weight 238 inserted into the flapper valve 118 is shaped to approximate the general interior shape of the valve. In an embodiment, a radial slot 244 is cut into the weight. The slot extends approximately midway into the weight and may have an approximate width of 0.1875 inches. The slot facilitates the insertion of the weight into the valve opening as described further herein.
The weight can be made of any material that has a specific gravity greater than water. Lead which has a specific gravity of 11.3 can be used. However, zinc with a specific gravity of 7.1 or irons with specific gravities between 7.0 to 7.9 can also be used.
The flush valve 118 can be modified by following the steps of
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The drive or timer mechanism 354 can include conventional design elements for facilitating the automatic release of a cable or chain after a specified period of time. For instance, the timer can include, at least in part, the device disclosed in U.S. Pat. No. 4,469,197 to Minour, incorporated herein by reference. As such, the timer mechanism can include a spring 358 that is installed within a circular recess 360 formed in a frame 362 which is assembled within another frame 364 by snap engagement with each other.
Reference numeral 366 of
Although a single shaft 366 is depicted wherein knob 352 and pulley 356 are connected to opposite ends thereof, it will be appreciated by those having ordinary skill in the art that the controller can be designed so the knob and pulley are mounted on different shafts that are operatively connected together to perform the desired operation as described herein.
The circular recess 360 is provided with a guide slit 376 through which can be wound the spring, and the shaft 366 with a pointed or rounded head 366a is inserted through holes 378, 378′ of the frames 362, 364 to hold the spring 358.
Gear 368 is provided on its rear side with a spring engaging slit 380 formed by a pair of opposing projections 382, 382′.
On the inner peripheral surface of the circular recess 360 there is formed a plurality of small recesses 384 spaced from each other for receiving the curved rear portion 358a of the spring 358.
Furthermore, in the drawing 386a through 386e show each of the gears of the gear mechanism 374; 388, 390 and 392 and their support shafts, respectively; 368′ is a gear formed integrally with the gear 368 which is to be engaged with the gear 386e.
In addition, 394 is a cover applied to the frame 362; 396 are snaps provided on the frame 364 and to be inserted into the recesses 398 of the cover 394 and engage with respective engaging portions 351.
The frame 362 is formed with wall faces 353a, 353b and 353c of split circular shape for receiving the gears 374a, 374b, 374c, 374d and 374e, so that at the time of assembly the gears 368, 370 and gear mechanism 374 can be held without the shafts 377 and 372.
Numeral 355 denotes an insertion hole for the shaft 372; 357 an insertion slot for the support shaft 388; 359 an insertion hole for the support shaft 390′; 361 is an insertion slot for the support shaft 392; 363 are pins which project from the frame 362 and which are to be inserted into the holes 365 of the cover 394 as well as the holes 367 of the frame 364.
Numeral 369 is a guide slit for the spring 358 formed in the frame 362.
In an embodiment, the gear 368, pinion 370 and the gear mechanism 386 are assembled together in the frame 362 and, after the cover 394 has been applied thereto, the frame 364 is assembled to the frame 362 by snap engagement; and after the shaft 372 has been inserted through the hole 355 into the hole 370a of the pinion 370 the pointed head of the spring 358 is inserted through the guide slit 369 formed in the frame 362 and further through the guide slit 376 formed in the circular recess 360, into the slit 380 between the projections 382 and 382′ provided in the gear 368 (
The shaft 366 is then pressed through an aperture extending through the central axis of pulley 356. Accordingly, rotation of the shaft 366 results in like rotation of the pulley 356.
In an embodiment, the controller housing 350 is made of plastic, metal, or a metal alloy and is generally cylindrical with a cavity 371 for containing the timer 354. The housing 350 includes a planar front surface 373 that, as shown in
Like the housing 350, the control knob 352 is generally cylindrical and can be made of plastic, metal or a metal alloy. The knob 352 has a planar front surface 377 having indicia 379 thereon to show the currently selected flush time or duration.
The knob 352 is mounted on the distal end of the shaft 366 about the front 373 of the housing 350 and is in coaxial alignment with the shaft, the housing 350 and the pulley 356. Accordingly, rotation of the knob 352 results in like rotation of the pulley 356 and thus retracts or releases the cable 382 attached to the pulley.
Directly or indirectly attached to the controller housing 350 is a threaded metal or metal allow rod 379 having a cylindrical passage 381 passing therethrough. In an embodiment, the shaft 366 of the controller extends through the passage 381 in the rod 379.
The controller 228 can be attached to the tank 112 of a toilet by removing the pre-existing handle assembly 128, if present. The threaded rod 379 of the controller can then be inserted into the aperture in the tank that was previously occupied, in part, by the handle assembly 128. A plastic bolt or the like can be threaded onto the rod 379 to secure the controller 228 to the tank 112. Then, the pulley 356 can be pressed onto the end of the shaft 366 within the tank 112.
The mechanical linkage 230 between the flush controller 228 and the flush valve 216 can be provided by attaching the cable 383 to a preexisting chain 131 attached to the flush valve 216. Alternatively, the cable 383 can be attached directly to the flush valve 216. Thus, omitting the chain.
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A coil spring 393 is mounted in the cavity of tubular member 391 wherein the spring is compressed as the tubular members 389,391 are pressed together. Accordingly, the length of the guide assembly 387 is adjustable to fit within toilet tanks of various widths. Furthermore, the spring 393 provides for securing installing the assembly 387 in a toilet tank 112 by pressing the ends of the assembly against the inner walls of the tank. In an embodiment, rubber disks 337 can be glued to the ends of the assembly 387 to prevent the assembly from slipping inside the tank.
Preferably, ears 395 and 397 outwardly extend from the distal ends of the tubular members 389 and 391, respectively. Preferably, when the assembly 387 is mounted in a toilet tank, the ears 395,397 rest on the top of the tank 112 to prevent the assembly from being pulled into the tank 395,397 when opening the flush valve.
In an embodiment, one or more grooves 399 can be formed on the outer surface of the tubular members 389 and 391. Turning to
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Also, in the guide assembly of
To operate the system, a user twists the knob 353 on the flush controller 228 to a desired marked location on the controller housing 373. As a result of the user twisting the knob 353, the pulley rotates to retract the cable 383 and thus open the flush valve 216.
When the user releases the knob 353, the timer assembly 354 automatically (i.e., without human intervention) allows the pulley to slowly rotate in the opposite direction to release the cable 383 and thus close the flush valve 216. In particular, the rate of rotation of the pulley, and thus release rate of the cable 383, is determined at least in part by the tension of the spring and the gearing ratio used within the timer 354, which are directly or indirectly attached to the pulley shaft 366. Moreover, because the flush valve is non-buoyant, the valve immediately begins to close as the cable is released.
Accordingly, when a short duration flush is desired, then the user can twist the knob 353 by a small amount. In contrast, when a long flush is desired, then user can twist the knob by a greater amount which, in turn, will result in a longer time (i.e., duration) until the valve is closed.
As will be appreciated by those having ordinary skill in the art, a spring may not be needed in the timing assembly of the controller 228. Instead, in an embodiment, the weight of the non-buoyant flush valve and the gearing ratio used within the timer assembly 354 will cause the flush valve 216 to close at a desired rate.
As will also be appreciated by those having ordinary skill in the art, the cable 383, pulley 356 and guide assembly 384 can be replaced by a single arm or rod 1483 as depicted in
Accordingly, rotation of the controller shaft 366 in one direction causes the flush valve 216 to open, and rotation of the controller shaft in the opposite direction allows the flush valve to close.
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The battery 423 provides power for the controller 410 and can consist of one or more conventional household batteries. Accordingly, the battery 423 may be directly or indirectly operatively connected to the touchpad 425, microcontroller 427 and solenoid 429 for providing power to these functional blocks of the controller.
The solenoid 429 is a conventional electromechanical device and provides for retracting and releasing the flush valve 216 upon receiving one or more electrical commands from the microcontroller 427. Thus, the solenoid can be directly or indirectly attached to the cable 383 via a pulley or other mechanical linkage.
As indicated previously, the microcontroller 427 provides signals to the solenoid 429 for opening and closing the flush valve 216. In an embodiment, the microcontroller is a conventional device having a processor, timer, random access memory and a read-only memory. In an alterative embodiment, the microcontroller is a programmable logic array.
The microcontroller 427 is operatively coupled to the touchpad to receive commands from a user. In particular, the microcontroller 427 electrically commands the solenoid to open the flush valve for a duration of time based upon a command signal received form the touchpad 425.
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It should be emphasized that the above-described embodiments of the present invention, particularly, any “preferred” embodiments, are possible examples of implementations merely set forth for a clear understanding of the principles for the invention. Many other variations and modifications may be made to the above-described embodiment(s) of the invention without substantially departing from the spirit and principles of the invention. Accordingly, all such modifications are intended to be included herein within the scope of this disclosure and the present invention, and protected by the following claims.